For the record, the problem with your original syntax was that you were trying to go from referencing an SSRS field to entering a string without separating the two properly. If you wanted your previous syntax to work (without removing the target window's name (i.e., '_blank'), you would do it like this:
="javascript:void(window.open('https://na5.salesforce.com/" & Fields!id.Value & "','_blank'))"
I struggled with this for a long time, but you can make these pretty complex as long as you're careful to put everything together correctly. You can also add multiple javascript commands (but no functions) in the same action expression. Below is one of my most complicated SSRS Go-to-URL Action commands:
="Javascript:"
& IIF(left(Fields!Name.Value,11)="RESTRICTED-",
"alert('Restricted!'); ","") & IIF(Fields!Name_Alert.Value = 1, "alert('Alternate Alert!'); ","")
& "void(window.open('"
& Globals!ReportServerUrl
& "/Pages/ReportViewer.aspx?%2fJPD%2fPO_Dashboard%2fJuvenile_Profile&rs:Command=Render"
& "&rc:Parameters=true"
& "&Emp_Number="
& Parameters!Param1.Value
& “&ID=" & Fields!ID.Value & "'));"
The key is to make sure that any and all necessary single quotes required by javascript show up inside a string (i.e., "'").
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